/Engine/Source/Runtime/SlateCore/Public/Rendering/DrawElementTypes.h
void SetViewport ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< const [ISlateViewport](API\Runtime\SlateCore\Rendering\ISlateViewport) > & InViewport, const [FLinearColor](API\Runtime\Core\Math\FLinearColor) & InTint )